Coming from a dev at Bplus Games...
Most of the frame-rate issues in Zelda are just programming failures. If Nintendo sets the right people to it they can totally fix them.
Some dev friends and I have the same feeling about that. Because sometimes it is just a specific zoom ratio that makes the frame-rate drop. Just zoom in a bit closer or further away and it runs super smooth.
The problem is that the game wants to show both near and far LOD (Level of Detail) objects. This is a frame-rate killer if two objects are in each other. To show that, it would need around 10 times the power.
And if you see Kakariko Village, the framerate hell there, and then the more beautiful Hateno Village, which runs super smoothly, you see that doesn’t make sense. So something else is going wrong there.
Yet another wrinkle in the discussion of Breath of the Wild's framerate hiccups. There's even more said by the unnamed Bplus dev, which you can check out right here. If this is indeed true, it'll be interesting to see if Nintendo sends out a patch that fixes the hiccups. I'm not anywhere near qualified to discuss whether this bug discussion is a valid one or not, but it's certainly interesting.